TABLE II.
Mechanical property values for bolts, studs and hex cap screws.
Machined specimens from fasteners or on
Full size fasteners
parent barstock
Heat
Elongation Reduction
treatment Nominal Tensile
of area,
Yield
Proof
Tensile
Yield
in 4D
or
diameter strength, strength, stress, Rockwell strength strength, percent, percent,
Material condition (inches)
ksi min ksi min hardness ksi, min ksi, min
min
min
ksi
¾ or
1
1
1
2
2
2
75 -100
55
55
18
35
B80 min
75
As formed
less
2 or stress
relieved Over ¾
1
2
2
2
60-100
35
60
35
18
35
B70 min
1 or
3
85
C23-34
120
92
14
35
120-150
less
Hardened
Over 1-
3
1
4
5
5
and
B97 -C34
105
81
14
35
105-150
75
1½
Tempered
3
6
55
B90-99
90
58
14
35
Over 1½
90-150
2½ or
2,3
2
7
8
C25 -34
125
105
16
50
95
125-150
less
Quenched
Over 2½
2
2
7
5
B7
and
115
95
16
50
115-150
85
C22 -34
to 4
tempered
2
2
7
5
1
1
9
16
50
Over 4
85
C22 -34
115
95
115-150
2½ or
2,3
2
7
8
125
105
18
50
125-150
95
C25 -C34
less
Hardened
Over 2½
2
2
7
5
1
B16
and
95
17
45
115-150
85
C22 -C34
115
to 4
Tempered
2
2
7
5
1
1
1
45
Over 4
85
C22 -C34
115
95
17
115-150
2½ or
3
9
120
150
130
14
40
150-175
C32 -C39
Quenched
less
8
and
Tempered Over 2½
3
9
105
140
115
14
40
140-175
C30 -C39
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